package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.aliyun.dysmsapi20170525.Client;
import com.aliyun.dysmsapi20170525.models.SendSmsRequest;
import com.aliyun.dysmsapi20170525.models.SendSmsResponse;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Autowired
    private Client client;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) throws Exception {
        //1.验证手机号是否有效
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        //2.生成验证码
        String code = RandomUtil.randomNumbers(6);

        //3.保存验证码到session
        // session.setAttribute("code", code);

        //3.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        log.info("redis操作：{}", code);

        //4。发送验证码
        // 构造请求对象，请替换请求参数值
        SendSmsRequest sendSmsRequest = new SendSmsRequest()
                .setPhoneNumbers(phone)
                .setSignName("美食点评")
                .setTemplateCode("SMS_480245328")
                .setTemplateParam("{\"code\":\"" + code + "\"}"); // TemplateParam为序列化后的JSON字符串
        // 获取响应对象
        SendSmsResponse sendSmsResponse = client.sendSms(sendSmsRequest);
        // 响应包含服务端响应的 body 和 headers
        //log.debug("发送短信验证码响应：{}", toJSONString(sendSmsResponse));
        log.debug("发送短信验证码成功，验证码：{}", code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        // 2.校验验证码 从redis获取
        String cashCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cashCode == null || !cashCode.equals(code)) {
            // 3.不一致，报错
            return Result.fail("验证码错误");
        }

        // 4.一致，根据手机号查询用户
        User user = this.query().eq("phone", loginForm.getPhone()).one();

        // 5.判断用户是否存在
        if (user == null) {
            // 6.不存在，创建用户并保存
            user = createUserWithPhone(loginForm.getPhone());
        }

        // 7.保存用户信息到redis中
        // 7.1.随机生成一个token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        // 7.2.将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        // 7.3.存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        // 7.4.设置token有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.SECONDS);

        // 8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        // 1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        // 2.保存用户
        save(user);
        return user;
    }
}
